Except that software is usually few devs, lots of users. Here we are all contributors to the climate. So even if we all pick something different from our neighbor, changes can be made. Typical broken reasoning arising from comparing the way world works to software development.
I wonder how much CO2 impact the CI revolution in open source really has. While I see how this is convenient, I sometimes wonder if we really need to spin up a 30min build for every PR/commit. I have never heard the community reflect on the impact it has with all the convenient cloud computing. Just spin up a ton of hosts to do your thing, yes? If you can pay for it, its OK? I guess owners of fossil-fuel consuming vehicles think the same. So, where are the environmental activists in the open source area pointing fingers at CI usage?
These are the classical mistakes people make when optimizing software.
This way you end up spending a lot of effort to make your code 0.0012% faster.
I have no doubt this mistake will keep being made throughout all of human history.